{"id":323,"date":"2020-11-02T18:02:22","date_gmt":"2020-11-02T22:02:22","guid":{"rendered":"http:\/\/www.prglab.com\/blog\/?page_id=323"},"modified":"2020-11-02T18:02:22","modified_gmt":"2020-11-02T22:02:22","slug":"console","status":"publish","type":"page","link":"https:\/\/www.prglab.com\/blog\/cplusplus-tutorial\/cplusplus-basics\/console","title":{"rendered":"\u57fa\u672c\u8f93\u5165\u8f93\u51fa"},"content":{"rendered":"\n

1.5 \u63a7\u5236\u53f0\u4ea4\u4e92(Communication through console)<\/h2>\n\n\n\n

\u63a7\u5236\u53f0(console)\u662f\u7535\u8111\u7684\u6700\u57fa\u672c\u4ea4\u4e92\u63a5\u53e3\uff0c\u901a\u5e38\u5305\u62ec\u952e\u76d8(keyboard)\u548c\u5c4f\u5e55(screen)\u3002\u952e\u76d8\u901a\u5e38\u4e3a\u6807\u51c6\u8f93\u5165\u8bbe\u5907\uff0c\u800c \u5c4f\u5e55\u4e3a\u6807\u51c6\u8f93\u51fa\u8bbe\u5907\u3002<\/p>\n\n\n\n

\u5728C++\u7684iostream\u51fd\u6570\u5e93\u4e2d\uff0c\u4e00\u4e2a\u7a0b\u5e8f\u7684\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c\u4f9d\u9760\u4e24\u79cd\u6570\u636e\u6d41\uff1acin<\/strong> \u7ed9\u8f93\u5165\u4f7f\u7528\u548ccout<\/strong>\u7ed9\u8f93\u51fa\u4f7f\u7528\u3002\u53e6\u5916\uff0ccerr<\/strong>\u548cclog<\/strong>\u4e5f\u5df2\u7ecf\u88ab\u5b9e\u73b0\u2015\u2015\u5b83\u4eec\u662f\u4e24\u79cd\u7279\u6b8a\u8bbe\u8ba1\u7684\u6570\u636e\u6d41\u4e13\u95e8\u7528\u6765\u663e\u793a\u51fa\u9519\u4fe1\u606f\u3002\u5b83\u4eec\u53ef\u4ee5\u88ab\u91cd\u65b0\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa\u8bbe\u5907\u6216\u5230\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff08log file\uff09\u3002<\/p>\n\n\n\n

\u56e0\u6b64cout (\u6807\u51c6\u8f93\u51fa\u6d41)\u901a\u5e38\u88ab\u5b9a\u5411\u5230\u5c4f\u5e55\uff0c\u800ccin<\/strong> (\u6807\u51c6\u8f93\u5165\u6d41)\u901a\u5e38\u88ab\u5b9a\u5411\u5230\u952e\u76d8\u3002<\/p>\n\n\n\n

\u901a\u8fc7\u63a7\u5236\u8fd9\u4e24\u79cd\u6570\u636e\u6d41\uff0c\u4f60\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u4e0e\u7528\u6237\u4ea4\u4e92\uff0c\u56e0\u4e3a\u4f60\u53ef\u4ee5\u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u8f93\u51fa\u5e76\u4ece\u952e\u76d8\u63a5\u6536\u7528\u6237\u7684\u8f93\u5165\u3002<\/p>\n\n\n\n

\u8f93\u51faOutput (cout)<\/h3>\n\n\n\n

\u8f93\u51fa\u6d41cout\u4e0e\u91cd\u8f7d(overloaded)\u8fd0\u7b97\u7b26<<\u4e00\u8d77\u4f7f\u7528\uff1acout << “Output sentence”; \/\/ \u6253\u5370Output sentence\u5230\u5c4f\u5e55\u4e0a
cout << 120; \/\/ \u6253\u5370\u6570\u5b57 120 \u5230\u5c4f\u5e55\u4e0a
cout << x; \/\/ \u6253\u5370\u53d8\u91cf x \u7684\u503c\u5230\u5c4f\u5e55\u4e0a<\/p>\n\n\n\n

\u8fd0\u7b97\u7b26<<\u53c8\u53eb\u63d2\u5165\u8fd0\u7b97\u7b26(insertion operator) \u56e0\u4e3a\u5b83\u5c06\u540e\u9762\u6240\u8ddf\u7684\u6570\u636e\u63d2\u5165\u5230\u5b83\u524d\u9762\u7684\u6570\u636e\u6d41\u4e2d\u3002\u5728\u4ee5\u4e0a\u7684\u4f8b\u5b50\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cfOutput sentence\uff0c\u6570\u5b57\u5e38\u91cf120\u548c\u53d8\u91cfx\u5148\u540e\u88ab\u63d2\u5165\u8f93\u51fa\u6d41cout\u4e2d\u3002\u6ce8\u610f\u7b2c\u4e00\u53e5\u4e2d\u5b57\u7b26\u4e32\u5e38\u91cf\u662f\u88ab\u53cc\u5f15\u53f7\u5f15\u8d77\u6765\u7684\u3002\u6bcf\u5f53\u6211\u4eec\u4f7f\u7528\u5b57\u7b26\u4e32\u5e38\u91cf\u7684\u65f6\u5019\uff0c\u5fc5\u987b\u7528\u5f15\u53f7\u628a\u5b57\u7b26\u4e32\u5f15\u8d77\u6765\uff0c\u4ee5\u4fbf\u5c06\u5b83\u548c\u53d8\u91cf\u540d\u660e\u663e\u7684\u533a\u5206\u5f00\u6765\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u4e24\u4e2a\u8bed\u53e5\u662f\u4e0d\u540c\u7684\uff1acout << “Hello”; \/\/ \u6253\u5370\u5b57\u7b26\u4e32Hello\u5230\u5c4f\u5e55\u4e0a
cout << Hello; \/\/ \u628a\u53d8\u91cfHello\u5b58\u50a8\u7684\u5185\u5bb9\u6253\u5370\u5230\u5c4f\u5e55\u4e0a<\/p>\n\n\n\n

\u63d2\u5165\u8fd0\u7b97\u7b26insertion operator (<<)\u53ef\u4ee5\u5728\u540c\u4e00\u8bed\u53e5\u4e2d\u88ab\u591a\u6b21\u4f7f\u7528\uff1acout << “Hello, ” << “I am ” << “a C++ sentence”;<\/p>\n\n\n\n

\u4e0a\u9762\u8fd9\u4e00\u884c\u8bed\u53e5\u5c06\u4f1a\u6253\u5370 Hello, I am a C++ sentence<\/strong> \u5230\u5c4f\u5e55\u4e0a\u3002\u63d2\u5165\u8fd0\u7b97\u7b26(<<) \u7684\u91cd\u590d\u4f7f\u7528\u5728\u6211\u4eec\u60f3\u8981\u6253\u5370\u53d8\u91cf\u548c\u5185\u5bb9\u7684\u7ec4\u5408\u5185\u5bb9\u6216\u591a\u4e2a\u53d8\u91cf\u65f6\u6709\u6240\u4f53\u73b0\uff1acout << “Hello, I am ” << age << ” years old and my zipcode is ” << zipcode;<\/p>\n\n\n\n

\u5982\u679c\u6211\u4eec\u5047\u8bbe\u53d8\u91cfage\u7684\u503c\u4e3a24\uff0c\u53d8\u91cfzipcode\u7684\u503c\u4e3a90064\uff0c\u4ee5\u4e0a\u53e5\u5b50\u7684\u8f93\u51fa\u5c06\u4e3a\uff1a Hello, I am 24 years old and my zipcode is 90064<\/strong><\/p>\n\n\n\n

\u5fc5\u987b\u6ce8\u610f\uff0c\u9664\u975e\u6211\u4eec\u660e\u786e\u6307\u5b9a\uff0ccout\u5e76\u4e0d\u4f1a\u81ea\u52a8\u5728\u5176\u8f93\u51fa\u5185\u5bb9\u7684\u672b\u5c3e\u52a0\u6362\u884c\u7b26\uff0c\u56e0\u6b64\u4e0b\u9762\u7684\u8bed\u53e5\uff1acout << “This is a sentence.”;
cout << “This is another sentence.”;<\/p>\n\n\n\n

\u5c06\u4f1a\u6709\u5982\u4e0b\u5185\u5bb9\u8f93\u51fa\u5230\u5c4f\u5e55\uff1a<\/p>\n\n\n\n

This is a sentence.This is another sentence.<\/strong><\/p>\n\n\n\n

\u867d\u7136\u6211\u4eec\u5206\u522b\u8c03\u7528\u4e86\u4e24\u6b21cout<\/strong>\uff0c\u4e24\u4e2a\u53e5\u5b50\u8fd8\u662f\u88ab\u8f93\u51fa\u5728\u540c\u4e00\u884c\u3002\u6240\u4ee5\uff0c\u4e3a\u4e86\u5728\u8f93\u51fa\u4e2d\u6362\u884c\uff0c\u6211\u4eec\u5fc5\u987b\u63d2\u5165\u4e00\u4e2a\u6362\u884c\u7b26\u6765\u660e\u786e\u8868\u8fbe\u8fd9\u4e00\u8981\u6c42\u3002\u5728C++\u4e2d\u6362\u884c\u7b26\u53ef\u4ee5\u5199\u4f5c\\n<\/strong>:cout << “First sentence.\\n “;
cout << “Second sentence.\\nThird sentence.”;\u5c06\u4f1a\u4ea7\u751f\u5982\u4e0b\u8f93\u51fa\uff1aFirst sentence.
Second sentence.
Third sentence.<\/p>\n\n\n\n

\u53e6\u5916\uff0c\u4f60\u4e5f\u53ef\u4ee5\u7528\u64cd\u4f5c\u7b26endl\u6765\u6362\u884c\uff0c\u4f8b\u5982\uff1acout << “First sentence.” << endl;
cout << “Second sentence.” << endl;<\/p>\n\n\n\n

\u5c06\u4f1a\u8f93\u51fa\uff1aFirst sentence.
Second sentence.<\/p>\n\n\n\n

\u5f53\u64cd\u4f5c\u7b26endl\u88ab\u7528\u5728buffered streams\u4e2d\u65f6\u6709\u4e00\u70b9\u7279\u6b8a\uff1a\u5b83\u4eec\u88abflushed\u3002\u4e0d\u8fc7cout \u9ed8\u8ba4\u4e3aunbuffered\uff0c\u6240\u4ee5\u4e0d\u4f1a\u88ab\u5f71\u54cd\u3002 \u4f60\u53ef\u4ee5\u6682\u65f6\u4e0d\u7ba1\u8fd9\u4e00\u70b9\u3002<\/p>\n\n\n\n

\u4f60\u53ef\u4ee5\u4f7f\u7528\\n\u6216endl\u6765\u6307\u5b9acout\u8f93\u51fa\u6362\u884c\uff0c\u8bf7\u6ce8\u610f\u524d\u9762\u6240\u8bb2\u7684\u4e24\u8005\u7684\u4e0d\u540c\u7528\u6cd5\u3002<\/p>\n\n\n\n

\u8f93\u5165Input (cin)<\/h3>\n\n\n\n

C++\u4e2d\u7684\u6807\u51c6\u8f93\u5165\u662f\u901a\u8fc7\u5728cin\u6570\u636e\u6d41\u4e0a\u91cd\u8f7d\u8fd0\u7b97\u7b26extraction (>>) \u6765\u5b9e\u73b0\u7684\u3002\u5b83\u540e\u9762\u5fc5\u987b\u8ddf\u4e00\u4e2a\u53d8\u91cf\u4ee5\u4fbf\u5b58\u50a8\u8bfb\u5165\u7684\u6570\u636e\u3002\u4f8b\u5982\uff1aint age;
cin >> age;<\/p>\n\n\n\n

\u58f0\u660e\u4e00\u4e2a\u6574\u578b\u53d8\u91cfage\u7136\u540e\u7b49\u5f85\u7528\u6237\u4ece\u952e\u76d8\u8f93\u5165\u5230cin\u5e76\u5c06\u8f93\u5165\u503c\u5b58\u50a8\u5728\u8fd9\u4e2a\u53d8\u91cf\u4e2d\u3002<\/p>\n\n\n\n

cin<\/strong> \u53ea\u80fd\u5728\u952e\u76d8\u8f93\u5165\u56de\u8f66\u952e(RETURN)\u540e\u624d\u80fd\u5904\u7406\u524d\u9762\u8f93\u5165\u7684\u5185\u5bb9\u3002\u56e0\u6b64\u5373\u4f7f\u4f60\u53ea\u8981\u6c42\u8f93\u5165\u4e00\u4e2a\u5355\u72ec\u7684\u5b57\u7b26\uff0c\u5728\u7528\u6237\u6309\u4e0b\u56de\u8f66\u952e(RETURN)\u4e4b\u524dcin<\/strong>\u5c06\u4e0d\u4f1a\u5904\u7406\u7528\u6237\u7684\u8f93\u5165\u7684\u5b57\u7b26\u3002<\/p>\n\n\n\n

\u5728\u4f7f\u7528cin<\/strong>\u8f93\u5165\u7684\u65f6\u5019\u5fc5\u987b\u8003\u8651\u540e\u9762\u7684\u53d8\u91cf\u7c7b\u578b\u3002\u5982\u679c\u4f60\u8981\u6c42\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff0cextraction (>>) \u540e\u9762\u5fc5\u987b\u8ddf\u4e00\u4e2a\u6574\u578b\u53d8\u91cf\uff0c\u5982\u679c\u8981\u6c42\u4e00\u4e2a\u5b57\u7b26\uff0c\u540e\u9762\u5fc5\u987b\u8ddf\u4e00\u4e2a\u5b57\u7b26\u578b\u53d8\u91cf\uff0c\u5982\u679c\u8981\u6c42\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u540e\u9762\u5fc5\u987b\u8ddf\u4e00\u4e2a\u5b57\u7b26\u4e32\u578b\u53d8\u91cf\u3002<\/p>\n\n\n\n

\/\/ i\/o example
#include <iostream.h>
int main ()
{
int i;
cout << “Please enter an integer value: “;
cin >> i;
cout << “The value you entered is ” << i;
cout << ” and its double is ” << i*2 << “.\\n”;
return 0;
}<\/td>		Please enter an integer value: 702
The value you entered is 702 and its double is 1404.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4f7f\u7528\u7a0b\u5e8f\u7684\u7528\u6237\u53ef\u4ee5\u4f7f\u5f15\u8d77\u9519\u8bef\u7684\u539f\u56e0\u4e4b\u4e00\uff0c\u5373\u4f7f\u662f\u5728\u6700\u7b80\u5355\u7684\u9700\u8981\u7528cin\u505a\u8f93\u5165\u7684\u7a0b\u5e8f\u4e2d\uff08\u5c31\u50cf\u6211\u4eec\u4e0a\u9762\u770b\u5230\u7684\u8fd9\u4e2a\u7a0b\u5e8f\uff09\u3002\u56e0\u4e3a\u5982\u679c\u4f60\u8981\u6c42\u8f93\u5165\u4e00\u4e2a\u6574\u6570\u6570\u503c\uff0c\u800c\u7528\u6237\u8f93\u5165\u4e86\u4e00\u4e2a\u540d\u5b57\uff08\u4e00\u4e2a\u5b57\u7b26\u4e32\uff09\uff0c\u5176\u7ed3\u679c\u53ef\u80fd\u5bfc\u81f4\u7a0b\u5e8f\u4ea7\u751f\u9519\u8bef\u64cd\u4f5c\uff0c\u56e0\u4e3a\u5b83\u4e0d\u662f\u6211\u4eec\u671f\u671b\u4ece\u7528\u6237\u5904\u83b7\u5f97\u7684\u6570\u636e\u3002\u5f53\u4f60\u4f7f\u7528\u7531cin \u8f93\u5165\u7684\u6570\u636e\u7684\u65f6\u5019\uff0c\u4f60\u4e0d\u5f97\u4e0d\u5047\u8bbe\u7a0b\u5e8f\u7684\u7528\u6237\u5c06\u4f1a\u5b8c\u5168\u5408\u4f5c\u800c\u4e0d\u4f1a\u5728\u7a0b\u5e8f\u8981\u6c42\u8f93\u5165\u6574\u6570\u7684\u65f6\u5019\u8f93\u5165\u4ed6\u7684\u540d\u5b57\u3002\u540e\u9762\u5f53\u6211\u4eec\u770b\u5230\u600e\u6837\u4f7f\u7528\u5b57\u7b26\u4e32\u7684\u65f6\u5019\uff0c\u6211\u4eec\u5c06\u4f1a\u540c\u65f6\u770b\u5230\u4e00\u4e9b\u89e3\u51b3\u8fd9\u4e00\u7c7b\u51fa\u9519\u95ee\u9898\u7684\u529e\u6cd5\u3002<\/p>\n\n\n\n

\u4f60\u4e5f\u53ef\u4ee5\u5229\u7528cin \u8981\u6c42\u7528\u6237\u8f93\u5165\u591a\u4e2a\u6570\u636e \uff1acin >> a >> b;<\/p>\n\n\n\n

\u7b49\u540c\u4e8e\uff1acin >> a;
cin >> b;<\/p>\n\n\n\n

\u5728\u4ee5\u4e0a\u4e24\u79cd\u60c5\u51b5\u4e0b\u7528\u6237\u90fd\u5fc5\u987b\u8f93\u5165\u4e24\u4e2a\u6570\u636e\uff0c\u4e00\u4e2a\u7ed9\u53d8\u91cfa\uff0c\u4e00\u4e2a\u7ed9\u53d8\u91cfb\u3002\u8f93\u5165\u65f6\u4e24\u4e2a\u53d8\u91cf\u4e4b\u95f4\u53ef\u4ee5\u4ee5\u4efb\u4f55\u6709\u6548\u7684\u7a7a\u767d\u7b26\u53f7\u95f4\u9694\uff0c\u5305\u62ec\u7a7a\u683c\uff0c\u8df3\u8dc3\u7b26tab\u6216\u6362\u884c\u3002<\/p>\n\n\n\n

cin\u548c\u5b57\u7b26\u4e32<\/h3>\n\n\n\n

\u6211\u4eec\u53ef\u4ee5\u50cf\u8bfb\u53d6\u57fa\u672c\u7c7b\u578b\u6570\u636e\u4e00\u6837\uff0c\u4f7f\u7528cin\u548c>>\u64cd\u4f5c\u7b26\u6765\u8bfb\u53d6\u5b57\u7b26\u4e32\uff0c\u4f8b\u5982\uff1acin >> mystring;<\/p>\n\n\n\n

\u4f46\u662f\uff0ccin >> \u53ea\u80fd\u8bfb\u53d6\u4e00\u4e2a\u5355\u8bcd\uff0c\u4e00\u65e6\u78b0\u5230\u4efb\u4f55\u7a7a\u683c\uff0c\u8bfb\u53d6\u64cd\u4f5c\u5c31\u4f1a\u505c\u6b62\u3002\u5728\u5f88\u591a\u65f6\u5019\u8fd9\u5e76\u4e0d\u662f\u6211\u4eec\u60f3\u8981\u7684\u64cd\u4f5c\uff0c\u6bd4\u5982\u6211\u4eec\u5e0c\u671b\u7528\u6237\u8f93\u5165\u4e00\u4e2a\u82f1\u6587\u53e5\u5b50\uff0c\u90a3\u4e48\u8fd9\u79cd\u65b9\u6cd5\u5c31\u65e0\u6cd5\u8bfb\u53d6\u5b8c\u6574\u7684\u53e5\u5b50\uff0c\u56e0\u4e3a\u4e00\u5b9a\u4f1a\u9047\u5230\u7a7a\u683c\u3002<\/p>\n\n\n\n

\u8981\u4e00\u6b21\u8bfb\u53d6\u4e00\u6574\u884c\u8f93\u5165\uff0c\u9700\u8981\u4f7f\u7528C++\u7684\u51fd\u6570 getline\uff0c\u76f8\u5bf9\u4e8e\u662f\u7528cin\uff0c\u6211\u4eec\u66f4\u5efa\u8bae\u4f7f\u7528getline\u6765\u8bfb\u53d6\u7528\u6237\u8f93\u5165\u3002<\/p>\n\n\n\n

\u4f8b\u5982\uff1a<\/p>\n\n\n\n

\/\/ \u8bfb\u53d6\u5b57\u7b26\u4e32\u4f8b\u5b50
#include <iostream>
#include <string>
using namespace std;

int main ()
{
string mystr;
cout << “What’s your name? “;
getline (cin, mystr);
cout << “Hello ” << mystr << “.\\n”;
cout << “What is your favorite color? “;
getline (cin, mystr);
cout << “I like ” << mystr << ” too!\\n”;
return 0;
}<\/td>		What’s your name? Aqua
Hello Aqua.
What is your favorite color? blue
I like blue too!<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

\u4f60\u53ef\u80fd\u6ce8\u610f\u5230\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u4e24\u6b21\u8c03\u7528 getline \u51fd\u6570\u6211\u4eec\u90fd\u662f\u7528\u4e86\u540c\u4e00\u4e2a\u5b57\u7b26\u4e32\u53d8\u91cf(mystr)\u3002\u5728\u7b2c\u4e8c\u6b21\u8c03\u7528\u7684\u65f6\u5019\uff0c\u7a0b\u5e8f\u4f1a\u81ea\u52a8\u7528\u7b2c\u4e8c\u6b21\u8f93\u5165\u7684\u5185\u5bb9\u53d6\u4ee3\u4ee5\u524d\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n

\u5b57\u7b26\u4e32\u6d41\u3000\uff08stringsteam\uff09<\/h3>\n\n\n\n

\u6807\u51c6\u5934\u6587\u4ef6 <sstream> \u5b9a\u4e49\u4e86\u4e00\u4e2a\u53eb\u505a\u3000stringstream \u7684\u7c7b\uff0c\u4f7f\u7528\u8fd9\u4e2a\u7c7b\u53ef\u4ee5\u5bf9\u57fa\u4e8e\u5b57\u7b26\u4e32\u7684\u5bf9\u8c61\u8fdb\u884c\u50cf\u6d41\uff08\uff53\uff54\uff52\uff45\uff41\uff4d\uff09\u4e00\u6837\u7684\u64cd\u4f5c\u3002\u8fd9\u6837\uff0c\u6211\u4eec\u53ef\u4ee5\u5bf9\u5b57\u7b26\u4e32\u8fdb\u884c\u62bd\u53d6\u548c\u63d2\u5165\u64cd\u4f5c\uff0c\u8fd9\u5bf9\u5c06\u5b57\u7b26\u4e32\u4e0e\u6570\u503c\u4e92\u76f8\u8f6c\u6362\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u4eec\u60f3\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u4e3a\u4e00\u4e2a\u6574\u6570\uff0c\u53ef\u4ee5\u8fd9\u6837\u5199\uff1a<\/p>\n\n\n\n

string mystr (\"1204\");
int myint;
stringstream(mystr) >> myint;<\/pre>\n\n\n\n
\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u5148\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u5bf9\u8c61mystr\uff0c\u521d\u59cb\u503c\u4e3a”1204″\uff0c\u53c8\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6574\u6570\u53d8\u91cfmyint\u3002\u7136\u540e\u6211\u4eec\u4f7f\u7528 stringstream \u7c7b\u7684\u6784\u9020\u51fd\u6570\u5b9a\u4e49\u4e86\u8fd9\u4e2a\u7c7b\u7684\u5bf9\u8c61\uff0c\u5e76\u4ee5\u5b57\u7b26\u4e32\u53d8\u91cfmystr\u4e3a\u53c2\u6570\u3002\u56e0\u4e3a\u6211\u4eec\u53ef\u4ee5\u50cf\u4f7f\u7528\u6d41\u4e00\u6837\u4f7f\u7528stringstream \u7684\u5bf9\u8c61\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u50cf\u4f7f\u7528cin\u90a3\u6837\u4f7f\u7528\u64cd\u4f5c\u7b26 >> \u540e\u9762\u8ddf\u4e00\u4e2a\u6574\u6570\u53d8\u91cf\u6765\u8fdb\u884c\u63d0\u53d6\u6574\u6570\u6570\u636e\u3002\u8fd9\u6bb5\u4ee3\u7801\u6267\u884c\u4e4b\u540e\u53d8\u91cf myint \u5b58\u50a8\u7684\u662f\u6570\u503c 1204 \u3002<\/p>\n\n\n\n
\/\/ \u5b57\u7b26\u4e32\u6d41\u7684\u4f7f\u7528\u793a\u4f8b
#include <iostream>
#include <string>
#include <sstream>
using namespace std;

int main ()
{
string mystr;
float price=0;
int quantity=0;

cout << “Enter price: “;
getline (cin,mystr);
stringstream(mystr) >> price;
cout << “Enter quantity: “;
getline (cin,mystr);
stringstream(mystr) >> quantity;
cout << “Total price: ” << price*quantity << endl;
return 0;
}<\/td>		Enter price: 22.25
Enter quantity: 7
Total price: 155.75<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u8981\u6c42\u7528\u6237\u8f93\u5165\u6570\u503c\uff0c\u4f46\u4e0d\u540c\u4e8e\u4ece\u6807\u51c6\u8f93\u5165\u4e2d\u76f4\u63a5\u8bfb\u53d6\u6570\u503c\uff0c\u6211\u4eec\u4f7f\u7528\u51fd\u6570getline\u4ece\u6807\u6ce8\u8f93\u5165\u6d41cin\u4e2d\u8bfb\u53d6\u5b57\u7b26\u4e32\u5bf9\u8c61(mystr)\uff0c\u7136\u540e\u518d\u4ece\u8fd9\u4e2a\u5b57\u7b26\u4e32\u5bf9\u8c61\u4e2d\u63d0\u53d6\u6570\u503cprice\u548cquantity\u3002<\/p>\n\n\n\n
\u901a\u8fc7\u4f7f\u7528\u8fd9\u79cd\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u5bf9\u7528\u6237\u7684\u8f93\u5165\u6709\u66f4\u591a\u7684\u63a7\u5236\uff0c\u56e0\u4e3a\u5b83\u5c06\u7528\u6237\u8f93\u5165\u4e0e\u5bf9\u8f93\u5165\u7684\u89e3\u91ca\u5206\u79bb\uff0c\u53ea\u8981\u6c42\u7528\u6237\u8f93\u5165\u6574\u884c\u7684\u5185\u5bb9\uff0c\u7136\u540e\u518d\u5bf9\u7528\u6237\u8f93\u5165\u7684\u5185\u5bb9\u8fdb\u884c\u68c0\u9a8c\u64cd\u4f5c\u3002\u8fd9\u79cd\u505a\u6cd5\u5728\u7528\u6237\u8f93\u5165\u6bd4\u8f83\u96c6\u4e2d\u7684\u7a0b\u5e8f\u4e2d\u662f\u975e\u5e38\u63a8\u8350\u4f7f\u7528\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
1.5 \u63a7\u5236\u53f0\u4ea4\u4e92(Communication through console) \u63a7\u5236\u53f0(console)\u662f\u7535\u8111\u7684\u6700\u57fa\u672c\u4ea4\u4e92\u63a5\u53e3\uff0c\u901a\u5e38\u5305\u62ec\u952e\u76d8(keyboard)\u548c\u5c4f\u5e55(screen)\u3002\u952e\u76d8\u901a\u5e38\u4e3a\u6807\u51c6\u8f93\u5165\u8bbe\u5907\uff0c\u800c \u5c4f\u5e55\u4e3a\u6807\u51c6\u8f93\u51fa\u8bbe\u5907\u3002 \u5728C++\u7684iostream\u51fd\u6570\u5e93\u4e2d\uff0c\u4e00\u4e2a\u7a0b\u5e8f\u7684\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u64cd\u4f5c\u4f9d\u9760\u4e24\u79cd\u6570\u636e\u6d41\uff1acin \u7ed9\u8f93\u5165\u4f7f\u7528\u548ccout\u7ed9\u8f93\u51fa\u4f7f\u7528\u3002\u53e6\u5916\uff0ccerr\u548cclog\u4e5f\u5df2\u7ecf\u88ab\u5b9e\u73b0\u2015\u2015\u5b83\u4eec\u662f\u4e24\u79cd\u7279\u6b8a\u8bbe\u8ba1\u7684\u6570\u636e\u6d41\u4e13\u95e8\u7528\u6765\u663e\u793a\u51fa\u9519\u4fe1\u606f\u3002\u5b83\u4eec\u53ef\u4ee5\u88ab\u91cd\u65b0\u5b9a\u5411\u5230\u6807\u51c6\u8f93\u51fa\u8bbe\u5907\u6216\u5230\u4e00\u4e2a\u65e5\u5fd7\u6587\u4ef6\uff08log file\uff09\u3002 \u56e0\u6b64cout (\u6807\u51c6\u8f93\u51fa\u6d41)\u901a\u5e38\u88ab\u5b9a\u5411\u5230\u5c4f\u5e55\uff0c\u800ccin (\u6807\u51c6\u8f93\u5165\u6d41)\u901a\u5e38\u88ab\u5b9a\u5411\u5230\u952e\u76d8\u3002 \u901a\u8fc7\u63a7\u5236\u8fd9\u4e24\u79cd\u6570\u636e\u6d41\uff0c\u4f60\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u4e0e\u7528\u6237\u4ea4\u4e92\uff0c\u56e0\u4e3a\u4f60\u53ef\u4ee5\u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u8f93\u51fa\u5e76\u4ece\u952e\u76d8\u63a5\u6536\u7528\u6237\u7684\u8f93\u5165\u3002 \u8f93\u51faOutput (cout) \u8f93\u51fa\u6d41cout\u4e0e\u91cd\u8f7d(overloaded)\u8fd0\u7b97\u7b26<<\u4e00\u8d77\u4f7f\u7528\uff1acout << “Output sentence”; \/\/ \u6253\u5370Output sentence\u5230\u5c4f\u5e55\u4e0acout << 120; \/\/ \u6253\u5370\u6570\u5b57 120 \u5230\u5c4f\u5e55\u4e0acout << x; \/\/ \u6253\u5370\u53d8\u91cf x \u7684\u503c\u5230\u5c4f\u5e55\u4e0a \u8fd0\u7b97\u7b26<<\u53c8\u53eb\u63d2\u5165\u8fd0\u7b97\u7b26(insertion operator) \u56e0\u4e3a\u5b83\u5c06\u540e\u9762\u6240\u8ddf\u7684\u6570\u636e\u63d2\u5165\u5230\u5b83\u524d\u9762\u7684\u6570\u636e\u6d41\u4e2d\u3002\u5728\u4ee5\u4e0a\u7684\u4f8b\u5b50\u4e2d\uff0c\u5b57\u7b26\u4e32\u5e38\u91cfOutput sentence\uff0c\u6570\u5b57\u5e38\u91cf120\u548c\u53d8\u91cfx\u5148\u540e\u88ab\u63d2\u5165\u8f93\u51fa\u6d41cout\u4e2d\u3002\u6ce8\u610f\u7b2c\u4e00\u53e5\u4e2d\u5b57\u7b26\u4e32\u5e38\u91cf\u662f\u88ab\u53cc\u5f15\u53f7\u5f15\u8d77\u6765\u7684\u3002\u6bcf\u5f53\u6211\u4eec\u4f7f\u7528\u5b57\u7b26\u4e32\u5e38\u91cf\u7684\u65f6\u5019\uff0c\u5fc5\u987b\u7528\u5f15\u53f7\u628a\u5b57\u7b26\u4e32\u5f15\u8d77\u6765\uff0c\u4ee5\u4fbf\u5c06\u5b83\u548c\u53d8\u91cf\u540d\u660e\u663e\u7684\u533a\u5206\u5f00\u6765\u3002\u4f8b\u5982\uff0c\u4e0b\u9762\u4e24\u4e2a\u8bed\u53e5\u662f\u4e0d\u540c\u7684\uff1acout << “Hello”; \/\/ \u6253\u5370\u5b57\u7b26\u4e32Hello\u5230\u5c4f\u5e55\u4e0acout << Hello; \/\/ \u628a\u53d8\u91cfHello\u5b58\u50a8\u7684\u5185\u5bb9\u6253\u5370\u5230\u5c4f\u5e55\u4e0a \u63d2\u5165\u8fd0\u7b97\u7b26insertion operator (<<)\u53ef\u4ee5\u5728\u540c\u4e00\u8bed\u53e5\u4e2d\u88ab\u591a\u6b21\u4f7f\u7528\uff1acout << “Hello, ” << “I am ” << “a C++ sentence”; \u4e0a\u9762\u8fd9\u4e00\u884c\u8bed\u53e5\u5c06\u4f1a\u6253\u5370 Hello, I […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":309,"menu_order":4,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/pages\/323"}],"collection":[{"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/comments?post=323"}],"version-history":[{"count":1,"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/pages\/323\/revisions"}],"predecessor-version":[{"id":324,"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/pages\/323\/revisions\/324"}],"up":[{"embeddable":true,"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/pages\/309"}],"wp:attachment":[{"href":"https:\/\/www.prglab.com\/blog\/wp-json\/wp\/v2\/media?parent=323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}